How to broke the pdf security to edit it

 If you think the protection of pdf is enough for nobody can edit it, you are wrong.
Just execute the follow sentence to broke it:

sudo apt-get install qpdf
qpdf --decrypt encrypted.pdf decrypted.pdf

Enjoy it!

Comments

Post a Comment

Popular posts from this blog

How to fix Android when developer options are not available for this user

Image
I have an Android One with Oreo version and suddenly my Android rebooted and after that it started to behave strangely: 1) Notification section doesn't work. I can't see notifications from my apps and the arrow and the screw icon to settings access don't work. 2) As I can't access to the notification area, I can't enable Use USB to Transfer Files to access to my phone memory. 3) I can't access to developer mode (I before active it with a lot of taps over Build number). Clicking on developer options just shows developer options are not available to this user. 4) I can't update or install the apps on google play. They freeze on Download pending... message 5) Home and Switch buttons don't work. They light up and vibrate when I tap them but they do nothing. This issue is apparently related to a deconfiguration of user accounts. To fix it, you need re-setup the users. As you can't access to the user manager (you are in guest mode ...
Read more

Contiki 3.0 on XM1000

Image
In other post, I installer contiki 3.x on xm1000. Now, we going to install contiki 3.0 (the lastest version). First, you need to dowload the lastest code from github: git clone https://github.com/contiki-os/contiki.git Now we need to add xm1000 compatibility to our contiki. Thanks to DMI   for the xm1000 patch. Without it, you will see the following error: make: *** No rule to make target 'obj_xm1000/cc2420.o', needed by 'contiki-xm1000.a'.  Stop. I upgrade his patch with an app to access to the xm1000 sensors. Download it from https://drive.google.com/file/d/0B7NXiwmWq7jCb3ROSFZZSWliMnc/view?usp=sharing Now, extract it into contiki folder: tar xzvf xm1000.tar.gz cd xm1000 cp -R * $YOUR_CONTIKI_PATH Go to the apps folder and execute an script that I create to automate the process: cd $YOUR_CONTIKI_PATH/platform/xm1000/apps/sensors ./install.sh Enjoy it!
Read more

Exception: Could not find a default OpenFlow controller in Mininet

If you try to run a mininet script like this  , maybe you will get this problem if you are under Ubuntu. Exception: Could not find a default OpenFlow controller  This is trigger because your system don't find a default controller . To enable it just add the first line and add the controller argument to net variable like the second line: from mininet.node import OVSController net = Mininet(topo=topo,host=CPULimitedHost, link=TCLink,controller = OVSController) Now, you will get the following error: c0 Cannot find required executable ovs-controller. Please make sure that it is installed and available in your $PATH: (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin) ovs-controller is a legacy name. You need to be sure that you has it. sudo apt-get install openvswitch-testcontroller sudo cp /usr/bin/ovs-testcontroller /usr/bin/ovs-controller If you run it again, you should kill ovs-testcontroller first to avoid this: Exception: Please s...
Read more